Xbox Game Pass Ultimate subscribers have a slew of new titles coming to Game Pass this September. Hitting the service, games include the Deep Silver action-adventure game Gods Will Fall, and from developer Headbang Club comes the rhythm game crossed with a shoot'em up, Double Kick Heroes.

Through Backwards Compatibility on Xbox and Xbox 360, the rollercoaster builder simulation game Thrillville, and the famous puzzle platformer Portal 2. 

Gods Will Fall (Available September 1 through September 30) - Take up the battle against the very deities themselves in this brutal action & adventure epic. The gods have lorded over the world for millennia ruling with a cruel iron fist that demands unquestioning fealty. You and your fellow Celtic warriors are the very last chance for humanity. Grab your mace, test your spear, and sharpen your ax to battle horrific beasts and minions that dwell in hellish lands of each god. Your decisions can make you a legend or you can be dust.

Double Kick Heroes (Available September 16 through October 15) - The pure power of Metal compels you! Travel the post-apocalyptic freeways battling zombies and militia in your tricked out Cadillac – the Gundillac. It’s a wild game that combos a shoot ‘em up with a rhythm game. Bang your head with your band thru 30 levels of madness and heavy, heavy metal.

Thrillville (Available September 1 through September 15) - Summer doesn’t have to ever end when you get to build your amusement park. You get to do everything from design roller coasters to go-carts, play mini-golf on your own courses, and join friends for party games. Make sure to check in with the guests to ensure they are loving your theme park as much as you are, and make adjustments to keep them happy! It’s non-stop fun in the virtual sun!

Portal 2 (Available September 16 through September 30) - One of the all-time classics is available for you to teleport into problem-solving mode. Use your wits over weapons in this sci-fi puzzler. In addition to portals, use tractor beams, lasers, light bridges, and more. With humorous new characters voiced by the likes of Stephen Merchant and J.K. Simmons, the story and humor is as much a joy as the problem-solving. Play single -player or co-op to start bending the rules of physics.